My numeric keypad has somehow got into a "mouse emulation" mode where the number keys just move the mouse pointer around (2 = down; 8 = up, 6 = right, etc). Anyone know how to make it work normally again?

None of the other numpad keys work either (I first noticed the whole thing when Ctrl + ÷ (numpad division sign) no longer produced "line comment" in IntelliJ IDEA). Toggling num lock doesn't affect this (though the indicator LED works as usual).

Any idea if it can be done dynamically using a script? I ask because I need this feature for my laptop at home but it can cause severe crashes at work (mouse pointer keeps moving downwards like crazy, forcing me to reboot) if I forget to turn it off.
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highsciguySep 11 '12 at 14:30